Effects of ZnO nanoparticles on wastewater treatment and their removal behavior in a membrane bioreactor (original) (raw)

Application Of Zno Nanoparticles In Biological Treatment Of Municipal Wastewater

2017

With the fast development of nanomaterials and nanotechnology, environmental nanotechnology has captivated increasing concerns in the past few decades. There are several nanomaterials in the earth, and a variety of modification held in future development. These Zinc nanoparticles illustrate antibacterial, anti-corrosive, and UV filtering premises. In the study, we determine the antibacterial action of nanoparticles of Zinc Oxide for the curing of city wastewater. Sample of wastewater were collected from sewage water, make three samples the sample I exposed to UV, and Sample II is treated with chlorine while other is control. Samples were than cultured on NA and EMB agar, next day microscopy, biochemical test, spot test to identify the specie was performed accordingly. From control sample Escherichia coli while from UV exposed and chlorine treated organism identified as Staphylococcus. epidermidis respectively, Nano particles of Zinc were prepared by mechano-chemical method then the...

The use of antibacterial activity of ZnO nanoparticles in the treatment of municipal wastewater

Water Science and Technology, 2014

Nanotechnology holds great potential in advanced water and wastewater treatment to improve treatment efficiency. Zinc oxide nanoparticles (ZnO NPs) have received considerable attention due to their unique antibacterial activities toward various microorganisms that are commonly found in the environment. In the present study, ZnO NPs were synthesized through both mechano-chemical and sol–gel methods. The synthesized ZnO NPs were characterized through X-ray diffraction and transmission electron microscopy techniques. Then, their antibacterial activities against separated wastewater bacteria were evaluated by determining the zone inhibitor, the minimum inhibitory concentration, and the minimum bactericidal concentration. The results were compared with those obtained from wastewater after chlorine disinfection and ultraviolet (UV) disinfection. These studies demonstrated that the antibacterial activity of ZnO NPs depends on the type and the strain of bacteria. They have also demonstrated...

Fate and behavior of ZnO and Ag engineered nanoparticles and their 1 bacterial viability assessment in a simulated wastewater treatment 2 plant 3 4

2014

16 17 Zinc oxide (ZnO) and metallic silver (Ag) engineered nanoparticles (ENPs) are 18 increasingly used in consumer nanoproducts (e.g. paints, sunscreens, etc.) to meet 19 customers’ needs as well as in industrial applications (e.g. remediation) to enhance 20 processes performance. As a result, ENPs will ultimately be released into the natural 21 environment as well as engineered systems (e.g. wastewater treatment plants 22 (WWTPs)). Here, we report findings on the fate, behaviour, and bacterial 23 viabilityassessment of ZnO and Ag ENPs in a simulated WWTP fed with municipal 24 wastewater. The ENPs were introduced at a dose rate of 0.83 mg/min for 240-hr to a 3L 25 bioreactor (simulated WWTP) with hydraulic residence time (HRT) of 6 hr. The 26 stability of the ENPs was found to be dependent on their dissolution and aggregation at 27 different pH, where ZnO exhibited the highest dissolution at low pH compared to Ag 28 ENPs. Also, the results showed that both ENPs had high affinity f...